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  Kinetic modeling of high-temperature oxidation of pure Mg

Ma, S., Xing, F., Ta, N., & Zhang, L. (2020). Kinetic modeling of high-temperature oxidation of pure Mg. Journal of Magnesium and Alloys, 8(3), 819-831. doi:10.1016/j.jma.2019.12.005.

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Kinetic modeling of high-temperature oxidation of pure Mg _ Elsevier Enhanced Reader.pdf (Verlagsversion), 6MB
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Kinetic modeling of high-temperature oxidation of pure Mg _ Elsevier Enhanced Reader.pdf
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2020
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Published by Elsevier B.V. on behalf of Chongqing University

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 Urheber:
Ma, Sa1, Autor
Xing, Fangzhou1, Autor
Ta, Na2, Autor           
Zhang, Lijun1, Autor
Affiliations:
1State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, P.R. China, ou_persistent22              
2Theory and Simulation, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863392              

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Schlagwörter: Data; Diffusion; Grain; High Temperature; Magnesium Oxide; Oxidation; Processes
 Zusammenfassung: A variety of experimental tracer diffusivities of Mg and O in magnesium oxide available in the literature were first assessed. Atomic mobilities including bulk and short-circuit diffusion of Mg and O were then obtained by means of the CALPHAD (Calculation of Phase Diagram) approach. Afterwards, the diffusion-controlled kinetic model of oxidation in a gas-MgO-Mg environment was developed based on the moving boundary model and Fick's law, coupling with the modified thermodynamic description of MgO. A mathematical expression for parabolic rate constant kp of the oxide scale was derived for magnesia and correlated with the thermodynamic and diffusion kinetic information. The evaluated kp results were in line with the experimental data. Finally, the oxidation process of pure magnesium at 673 K was model-predicted, and the predicted evolution of the oxide thicknesses agreed very well with the experimental data. It was indicated that the grain boundaries diffusion of magnesium cations predominated the high temperature oxidation process. © 2020

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Sprache(n): eng - English
 Datum: 2020-09
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1016/j.jma.2019.12.005
 Art des Abschluß: -

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Titel: Journal of Magnesium and Alloys
  Kurztitel : J. Magnes. Alloys
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: China : National Engineering Research Center for Magnesium Alloys of China, Chongqing University
Seiten: - Band / Heft: 8 (3) Artikelnummer: - Start- / Endseite: 819 - 831 Identifikator: ISSN: 22139567
CoNE: https://pure.mpg.de/cone/journals/resource/22139567